Rotary machine



Aug.. 19, 1930. H. wlLsEY .1,773,211

l ROTARY MACHINE Filed sept. 24, 1927 s sheets-sheet i Allll Aug. 19, 1930. l. H. WILSEY l 1,773,211

- -ROTARY MACHINE Filed Sept. 24, 1927 3 Sheets-Sheet 2 Aug. 19, 1930. l. H. w||.sEY 1,773,211

ROTARY MACHINE Filed Sept. 24, 1927 SSheets-Sheet 3 Patented Aug. 19, 1930 UNITED STATES PATENT OFFICE IRVEN H. WILSEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO JAMES B. TUTHILL, F

CHICAGO, ILLINOIS i ROTARY MACHINE Application filed September 24, 1927.

The invention relates to improvements in rotary machines, and particularly in rotary gear pumps wherein a pinion is eccentrically related to and in mesh with an internal vanek rotor, and a cut-off crescent or partition is disposed between the pinion and the rotor.

The primary object of the invention re.- sides in the provision of a plural stage pump of the above character, that is, for example, a pump having a primary rotor and pinion unit taking flu-id from an inlet passage, and having a secondary rotor and pinion unit taking exhaust fluid through suitable porting from said primary unit and delivering it to a discharge passage, said units being incorporated in a unitary st-ructure.

Another object is to provide a novel plural stage rotor and pinion pump having floating rotors, and/or inlet and discharge ports opening to the ends of the rotors.

Further objects are to provide a novel pump of the above character, the parts of which can be standardized, which can be readily assembled and disassembled, in which the pinions and the drive means are firmly supported, in which large bearing surfaces are provided to reduce Wear, leakage and Wabble, which has a large pumping capacity and a heavy lifting action, in which wear will not appreciably decrease the vacuum, and which is efficient in operation, and simple and inexpensive in construction.

Another object is to provide novel means for varying the flow through the pump.

Still another object resides in the provision of a novel leak-proof bearing for the drive shaft. y Y'.

Further objects and advantages will become apparent as the description proceeds.

In the accompanying drawings,

Figure 1 is a View inside elevation of a pump embodying the features of my invention. i

Fig. 2 is a` vertical longitudinal sectional View of the pump.

Fig. 3 is a sectional view taken along lin 3-3 of Fig. 2.

Fig. 4 is a view similar to Fig. 3 but with the rotor, pinion and shaft removed.

-view of the pump shown in Fig. 8.

Serial No. 221,693. i

Fig. 5 is a sectional view 5 5 of Fig.l 2.i

Fig. 6 is a view similar to Fig. 5 but with the rotor, pinion and' shaft removed.

Fig. 7 Vis a sectional view taken along line 55 74-7 of Fig. 2. l

Fig. 8 is a view in side elevation of a modified form of pump.

Fig. 9 is a vertical longitudinal sectional taken along line Fig. 10 is a sectional view taken along line 10-10 of Fig. 9. l

Fig. 11 is a sectional view taken along line 11-11 of Fig. 9.

Fig; 12 is an end view of a modified form 65 of the carrier forthe pinions in Fig. 9.

'Fig 13 is a modified form of the means for locking thev carrier in adjusted position. Fig. 14 is a view in end elevation of still another modification of the pump.

Fig. 15 is a sectional view taken along line 15-15 of Fig. 14.

Fig. 16 is a sectional View taken along line 16-16 of Fig. 15. y

Fig. 17 is a sectional View of the pump 75 casing taken along line 17-17 of Fig. 15.

While the invention is susceptible of various modifications and alternative constructions, I have shown in the drawings and will herein describe in detail the preferred 80 embodiment, but it is to be understood that I do not thereby intend to limit the invention to the specific form disclosed, but intend to cover all modifications and alternative constructions falling within the spirit and scope g5 of the invention as expressed in the appended claims.

Referring more particularly to .the drawings, the exemplary embodiment of the invention illustrated in Figs-1 to 7 consists of 90 a suitable pump casing 20 comprising two sections 21, 22 which may be secured together by any suitable means, such as a plurality of bolts 23, and which preferably are cylindrical in shape. One of the sections 21, 22 in the present instance the section 21, is supported y a suitable base 24 preferably formed integral therewith. The section 21 is formed in its inner face 25 with a cylindrical chamber 26, and 0n its outer end with an elongated 100 bearing hub 27 having a longitudinal bore 28 opening eccentrically to the chamber. The section 22 likewise is formed in its inner face 29 with a cylindrical chamber 30, and on its outer end with a bearing hub 31 having a bore 32 closed at its outer end and opening eccentrically to the chamber 30.

Formed on the outer end of the'section 21 at one side ofthe hub 27 is a tubular fitting 33 having a fluid passage 34 which terminates in a port 35 opening to one side of the chamber 26. Preferably, this port is formed in the inner end surface 36 of the chamber 26. A tubular fitting 37 also is formed on the outer end of the section 22 at one side of the hub 31, and has a fluid passage 38 terminating in a port 39 opening to one side of the chamber 30. Preferably, the port 39 is formed in the inner end surface 40 of the chamber 30. The ports 35, 39 preferably are formed in the same side of-the casing 20, and in directly opposed relation. The passages 34, 38 are adapted to be connected in a suitable fluid line (not shown).

While fluid may pass through the pump in either direction, for convenience the passages 34, 38 are designated respectively as the 1nlet passage and the discharge passage. The casing section 21 and the pumping elements therein would then constitute the primary unit, and the casing section 22 and the pumping elements therein would constitute the secondary unit.

The primary unit comprises a rotor 41 fitting closely in the chamber 26 and having internal vanes or teeth 42, and a pinion 43 eccentrically related to the rotor 41 and having external vanes or teeth 44 in mesh with the vanes 42. Preferably the rotor 41 comvprises a ring freely rotatable in the chamber 26, and appropriately designated a floating rotor. The pinion 43 is keyed to a suitable drive shaft 45 journalled in the hubs 27, 31, and extending out of the hub 27 for connection to a suitable powermeans (not shown). A crescent-shaped partition or projection 46 is disposed between the rotor 41 and the pinion 43. Preferably, the partition 46 is formed integral with the casing section 21, and has blunt ends.

The rotor 41, pinion 43 and partition 46 define internal suction andl pressure fiuid spaces 47, 48 respectively in opposite sides of the section 21. The fluid space 47 registers with the port 35, and the latter is shaped to conform substantially to the end area of the space. The rotor 41, pinion 43 and partition 46 extend fiush with the inner face 25 of the section 21.

The pumping elements of the secondary unit are similar to those of the primary unit, and corresponding parts are designated by similar reference numerals primed. In the secondary unit, the chamber 30 and the pumping elements therein are located relatively about the shaft 25 at 180 from the corresponding parts of the primary unit, so that the suction space 47 is aligned with the pressure space 48, and thev pressure space 48 registers with the port 39.

Interposed between the casing sections. 21, 22 is a separatingl wall or plate 49 having a port or opening 50 in one side registering with and connecting the spaces 48, 47 The port 50 is shaped to conform substantially to the adjacent end arcas of the spaces 48, 47.

Means is provided for preventing leakage of fluid along the shaft 45 through the hub 27. This means comprises a bushing 51 rigidly secured in the outer end of the bore 28. A fiexible corrugated cylindrical diaphragm 52, is disposed on the shaft 45 between the pinion 43 and the bushing 51. The inner end of the diaphragm 52 has a leak-tight connection with the pinion 43 which is obtained either by soldering or by pressing the two together. The outer end of the diaphragm 52 is ti glitlv secured, as by soldering to a lap ring 53A on the shaft 45 and bearing against the inner end of the bushing 51. Also disposed on the shaft 45, and bearing at its ends against the pinion 43 and the bushing 51 is a coiled compression spring 54. If a resilient diaphragm is employed, the spring can be dispensed with. Preferably the spring is I outside of the diaphragm.-

In operation, assuming that the shaft 45 is turning counter-clockwise as viewed in Fig. 5, fluid from the inlet passage 34 is drawn through the port 35 into the suction space 47 of the primary unit, then is carried by the rotor 41 and the pinion 43 past the par-r tition 46 to the pressure space 48, then passes through the port 50 to the suction space 47 of the secondary unit, then is carried by the rotor 41 and the pinion 43 past the partition 46 to the pressure space 48', and then is discharged through the port 39 into the discharge passage 38. While the pump described in the foregoing comprises but two stages, it will be understood thatany desired number of stages can be provided.

The modified form of the invention shown y in Figs. 8 to 13 is generally similar to that of Figs. 1 to 7, and corresponding parts are kdesignated by like reference numerals.

In the modified form` the chambers 26, 30'

are axially aligned so that the spaces 47, 48 are aligned respectively with the spaces 47, 48 and the fittings 33, 37 are formed onl the casing 2O at opposite sides of the shaft 45. The rotor 41 is formed on one end with a plate 56 which is connected to the drive shaft 45. The spaces 48, 47 are connected by a cored passage formed in the sections 2l and 22, and opening at its ends through the periphery of the rotor 41 and to the end of Ylull Inf) lll)

the rotor 41. The inletpassage 34 also opens to the periphery of the rotor 41. The passage 48 opens to the end of the rotor 41.

The separating wall or plate 49 is mounted in an annular notch 57 in the inner face 25 of the section 21. The pinions 43, 43 are secured to opposite ends of a stub shaft 58 journalled in the plate 49 so that the pri- ,v mary unit has a rotor drive, and the secondary unit has a pinion drive. The parti,- tions 46, 46 are formed on opposite sides of the plate 49. The plate 49 constitutes a carrier supporting the pinions 43, 43"and the partitions 46, 46 and is rotatably adjustable relative to the inlet and discharge ports so as to vary the fiow through the pump.

Means is provided for holding the carrier 49 in adjusted position. This means comprises a screw 59 having an adjusting knob 60 and threaded through the casing section 21 into engagement with one side of the carrier 49. In Fig. 13 is shown a modified means which comprises a pin 61 extending slidably through the end wall of the casing section 21 for selective engagement with apllurality of recesses 62 in one end of a modified carrier 63. The pin 61 is formed with an enlargement constituting a flange 64 slidable in a Ibore 65 closed at its outer end by a plug 66. A coiled compression spring 67 is disposed between the flange 64 and the plug 66. The

pin `61 is provided with a knob 68 for effecting release from the carrier 63. To adjust the fiow, the screw 59 (in one form) or the pin 61 (in the other form) is adjusted to release the carrier which then is automatically turned slowly by friction with the rotors 41, 41 and the pinions 43, 43. When the desired adjustment has been effected, the

screw 59 or pin 61 is caused to again engage j the carrier. v

The modified form of the invention shown in Figs. 14 to 17 is also similiar to the form shown in Figs. 1 to 7, and corresponding parts are designated by like reference numerals. In this form,l the section 22 constitutes acover for the section 21, and the latter is formed in its inner face 25 with a large bore 69. The

inner end of the bore-is reduced in size so as to `provide two eccentric cylindrical chambers, and an annular shoulder 70 therebetween, the outer and inner chambers corresponding respectively to the chambers 26, 30 in Fig. 2. The fittings 33 and 37 are arranged at opposite sides of the shaft 45, and are formed respectively on the cover, section 22 and the body section 21.

The separating wall or plate 49 is mounted in the chamber 26 and against the shoulder 70. In this instance Ithe partition 46 is formed integral with the plate 49, and the partition 46 is formed integral with the section 21. Since the chambers 26, 30 are axially aligned, the spaces 47, 47 will be in one side of the section 21, and the spaces 48, 48 will bein the otherside of the section. A cored passage 71 is formed in the casing 20, and the ends thereof terminate in ports 72, 73 opening respectively in the cover section 22 and the closed end of the body section 21 to the remote ends of the spaces 48, 47.

The operation of this pump upon clockwise rotation of the shaft 45 is the same as that of the pump shown in Figs. l to 7.

It will be evident that the pump, being a plural stage pump, will have a heavy liftmg action, and will not leak appreciably or suffer a reduction in vacuum due to wear. Large inlet and discharge areas are provided so that the pump is efficient in operation over a wide range of performance. The pump can 'be readily assembled and disassembled, and is simple and inexpensive in construction.

I claim as my invention:

1. A rotary machine having, in combination, a casing having inlet and discharge passages, two internal gear rotors in said casing, two pinions respectively in mesh with and eccentrically related to said rotors, two partitions respectively disposed between said rotors and said pinions, means for driving said rotors and pinions, the suction side of one rotor communicating with said inlet passage, the pressure side of the other rotor communieating with said discharge passage, a passage having end ports opening respectively to the pressure side of said first mentioned rotor and the suction side of said last mentioned rotor, and means for adjusting said pinions and said partitions relatively to said passages and said ports to vary the flow.

2. A rotary machine having, in combination, a casing closed at one end and comprising a cover closing the other end, the interior of said casingdefining two concentric alined cylindical chambers, one chamber being smaller in diameter than the other chamber, an internal gear rotor mounted in said smaller chamber, a'pinion eccentrically related to and in mesh with said rotor, a partition disposed between said pinion and said rotor, a separating plate between said chambers, a rotor in said larger chamber bearing ip? at one end against the outer face of said plate, a pinion eccentrically related to and in mesh with said last mentioned rotor, a partition formed on said plate and projecting between said last mentioned rotor and pinion, means for driving said pinion and rotor assemblies, an inlet passage opening through said casing to the suctionspace of said last mentioned rotor and pinion assembly, a cored passage in said casing connecting the discharge space of said last mentioned rotor and pinion assembly to the suction space of said first mentioned rotor and pinion assembly, and a discharge passage opening through said casing from the discharge space of said first mentioned rotor and pinion assembly.

3. A rotary machine having, in combination, a casing formed with two concentric alined cylmdrical chambers, one chamber being smaller in diameter than the other chamber, a separating wall between said chambers, an internal gear rotor mounted in the larger chamber, a pinion eccentrically related to and in mesh with said rotor, a

partition disposed betweensaid pinion and' said rotor, a rotor in the smaller chamber, a pinion eccentrically related to and in mesh with said last mentioned rotor, a partition disposed between said last mentioned rotor and pinion, means for driving said rotors` and pinions, an inlet passage opening to the suction space of said first mentioned rotor and pinion assembly, a cored passage in said casing connecting the discharge space of said first mentioned `rotor and pinion assembly to the suction space of said last mentioned rotor and pinion assembly, and a discharge passage openingr from the discharge space of said last mentioned rotor and pinion assembly.

4. A rotary machine having, in combination, a casing having a cylindrical chamber in one end, an internal gear rotor rotatably mounted in said casing, means for driving said rotor, an adjustable plate in said casing closing the end of said chamber, a stub shaft journaled in said plate, a pinion mounted on said stub shaft, said pinion meshing with and being eccentrically related to said rotor, a partition projecting from said plate between said rotor and said pinion, a fluid passage comn'mnicating with the space in one side of said rotor, a cover secured to said casing against said plate, saidcover being formed in its inner face with a cylindrical chamber alined with said first mentioned chamber, an internal gear rotor Inounted in said last mentioned chamber, a pinion mounted on said stub shaft, said last mentioned pinion being in mesh with said last mentioned rotor and eccentric thereto, a partition projecting from said plate between said last mentioned rotor and pinion, a fluid passage connecting the space in the other side of said first mentioned rotor withithe space in one rside of said second mentioned rotor, a fiuid passage opening from the space in th'e other side of said last mentioned rotor, and means for holding said plate in adjusted position.

5. A rotary machine having, in combination, a casing formed with two alined chambers, a rotatably adjustable carrier separating said chambers, two internal gear rotors, one in each chamber, means for driving one of said rotors, two pinions, one eccentrically related to and in mesh with each rotor, a shaft for supporting saidl pinions on opposite sides ofsaid carrier, two partitions one disposed between the pinion and the roto/r in each chamber, said partitions being supported on opposite sides of said carrier, an inlet passage opening to the suction space of the rotor and pinion assembly in one chamber, a passage connecting the discharge space of said first mentioned rotor and pinion assembly to the suction space of t-he rotor and i pinion assembly in the other chamber, and a discharge passage opening from the discharge space of said last mentioned rotor and pinion assembly.

6. A rotary machine having, in combination, a casing comprising two sections, an inlet passage opening into the interior of one section, an outlet passage opening from the interior of the other section, a primary unit comprising an internal gear rotor, a pinion eccentrically related to and in mesh with said rotor, and a partition disposed between said rotor and said pinion mounted in said first mentioned section, the suction s ace of said unit communicating with said in et passage, a. secondary unit comprising an internal gear rotor, a pinion eccentrically related to and in mesh with said rotor and a partition disposed between said rotor and said pinion mounted in said second mentioned casing, the pressure space of said secondary unit communicating with said discharge passage, means connecting the pressure space of said primary unit with the suction space of said secondary unit, means for driving one of said rotor, means for connecting said pinions, and means for adjusting said pinions and said partitions about a fixed axis.

7. A rotary machine having, in combination, a casing having two axially alined chambers, one chamber being smaller in dialneter then the other chamber, two internal gear rotors one mounted in each of said chambers, two pinions one in mesh with and eccentrically related to each of said rotors, said pinions having a driving connection, two partitions one projecting between the pinion and rotor in each chamber, a separating plate supporting said pinions, a shaft for driving one of said rotors and pinion assemblies, an inlet passage opening into the suction space of one of said chambers, a discharge passage opening from the pressure space of the other of said chambers, and meansfconnect- `ing the pressure space of the iirst mentioned chamber with the suction space of the last mentioned chamber.

8. A rotary machine having, in combination, va casing formed with two chambers, one chamber being smaller in diameter than and concentrically alined with the other chamber, an internal gear motor mounted in said smaller chamber,- a pinion eccen-l trically related to and in mesh with said rotor, a partition disposed between said rotor and said pinion, an internal gear rotor lil) mounted in said larger chamber, a pinion eccentrically related to and in mesh with said last mentioned rotor, aI partition disposed between said last mentioned rotor and pinion,

means for driving said rotor and pinion assemblies, a separating plate between said chambers and integral with said partitions, said plate acting as a support lor said ninions and being rotatively adjustable, means for holding said plate in an adjusted position an inlet passage opening to the suction side of one rotor and pinion assembly a passage from the pressure side 'of said last mentioned rotor and pinion assembly to the suction side ofthe other rotor and pinion assembly,.and a-n-outlet passage opening from the pressure side of said other rotor andv4 pinion assembly. y

l9. A rotary machine comprising, in combination, a casing having'a cover, the interior of said casing being formed withv separate chambers one of which is in the cover, a counter-recess formed in the outer face of said casing next to said cover, a plate interposed between said chambers and secured in said counter-recess, an 'inlet passage opening into one of said chambers, an outletpassage opening from the other of said chambers, a primary unit comprising an internal gear rotor, a pinion eccentrically related to and in mesh with said rotor, and a partition disposed between said rotor and said pinion .mounted in said rst mentioned chamber,

the suction space of said unit communicating with said inlet passage, a secondary unit comprising an internal gear rotor, a pinion eccentrically related to and in mesh with said rotor, and a partition disposed between said rotor and said pinion mounted in said second mentioned chamber, said partitions being formed integral with said p ate, the pressure spacevof said secondary unit communicating fixed my signature.

with said discharge passage, means connecty ing the pressure space of said primary unit with the suction space of said secondary unit, and means for driving said units.

10.* A rotary machine having in combination, a casing having two chambers, a plate separating said chambers and being rotatable', two i-nternal gear rotors in saidl casmg, two pinions respectively in mesh with said rotors and rotatably mounted on said plate, two partitions respectively disposed between said rotors and said pinions, means for driving said rotor and pinion assemblies, means effective at will for securing said plate against rotation, an inlet passage and discharge passage in said casing, the suction side of one rotor communicating with said inlet passage, the pressure side of the other rotor communicating with said discharge passage, and a passage having end ports opening respectivey to the pressure side of sai tioned rotor and the suction side of said last mentioned rotor. I

In testimony whereof, I have hereunto af- IRVEN H. WILSEY. 

